Pipe-mold.



PATENTED AUG. 2, 1904.

M. T. STEVENS.

PIPE MOLD.

APPLICATION FILED MAY zo, 1902.

NO MODEL.

Patented August 2, 1904.

PATENT OFFICE.

MAURICE T. STEVENS, OF HARVEY, ILLlNOlS.

PIPE-MOLD.

SPECIFICATION forming part of Letters Patent No. 766,739, dated August 2, 1904.

Application filed May 20, 1902. Serial No. 108,192. (No model.)

To all whom, it 11m/ 7j concern:

Be it known that I, MAURICE T. STEVENS, a citizen of the United States, residing' at Harvey, in the county of Cook and State of lllinois, have invented new and useful Improvements in Pipe-Molds, of which the following is a specification.

This invention relates to means for molding pipe from plastic material.

ln view of the expense incident to the present mode of constructing drain, water, and other pipes and the disadvantages from a commercial standpoint arising' from the usual burning or firing operations now generally pursued a demand exists for a practical production o'f pipe in a cheap and more expeditious manner than has heretofore been practiced. Furthermore, it is necessary in the formation of pipe by the use of plastic material to render the same as nearly equally dense throughout the length of the several pipesections as possible and at the same time maintain a uniformity of thickness throughout the body of the pipe.

The presentmeans comprising cooperating elements have been devised for practically producing' pipe-sections from cement or other plastic material which will closely adhere and become tenaciously homogeneous when dry and practically of the same degree of hardness as the ordinary burned or fired pipe-sections now commonly in use. The improved means is arranged to concentrate pressure applied to opposite terminals of the pipe-sections molded in a longitudinal direction and to take advantage of a moist plastic filling and end layers or portions of relatively dry material similar to the lling to cause the moisture in the filling to be absorbed largely by the relatively dry end portions of the molded section in order to relieve the intermediate iilling of an excess of moisture, with a better result in the finished product. The

improved means also comprises convenientlyoperated members or elements for forming a flange and flange-seat at opposite extremities of the molded pipe-section, the said members orelements being' so constructed that they maybe removed without injury to the corners or angles of the iiange and flange-seat.

The improved means also contemplates the provision of simple and effective pressure-applying' elements or members, as well as details of construction and arrang'cment of parts, which will expedite the formation of a pipesection.

lIn the drawings, Figure l is a longitudinal vertical section of the improved molding means and pressure devices, broken away in part and shown arranged in operative relation to a molding-pit. Fig. 2 is an enlarged transverse vertical section of a portion of one end of the improved means, particularlyshowing the devices for forming the flange at one end of the pipe-section. transverse vertical section of a portion of the opposite end of the molding element and particularly showing the means for forming the flange-seat at the opposite end of the pipesection. Fig. 4 is a transverse vertical section of the upper portion of the improved means embodying a modification in the construction and arrangement of parts.

Similar numerals of reference are employed to indicate corresponding parts in the several views.

The numeral 1 designates an outer-moldingeasing', which is formed from suitable sheetmetal and cylindrical in contour. A cylindrical sheet-metal core 2 of tubular form is adapted to be concentrically arranged in relation to the casing l, said core being considerably less in diameter than the casing and slightly shorter than the latter. Cooperating' with the easing l and core 2 is a pressure-head. 3 of less diameter than the casing', but adapted to snugly and movably lit in the latter, the said pressure-head having' the lower end of a screw 4 swivcled thereon and provided with a hand-wheel or analogous device 5. The screw movabl y extends through the center of a yoke 6, having' one terminal formed with a hook 7 for engagement with an eye 8 on thc upper end of a connectingrod 9. To the opposite end of the yoke 6 the upper end of a connecting-rod l0 is pivotally secured, the said rods 9 and 10 being' equal in length and having their lower ends formed as inturned hook-terminals l1 to removably lit in openings 1Q in the lower portion of a Fig. 3 is an enlarged4 IOO tubular cylindrical pressure-head 13, which ing-plugs at opposite ends of the casing 1 and core 2 are exact duplicates in construction, with the exception that the plug14 which is used at the lower end of the molding means is greater in diameter than that used at the upper end of said means and the plug 15 at the lower end of the molding means is less in diameter than thesimilar device at the upper end of said means. Furthermore, the plugs 15 are of less width than the plugs 14, and the plug 15 at the upper end of the molding means is located around the outer face of the upper. portion of the plug'14, whereas the lower plug 15 is applied to the inner face of its companion p'lug'14. Itfhas been heretofore stated that the plugs 14 and 15 are exact duplicates in construction.4 They are, in fact, of such duplicate construction,y

except that the upper plug 14 has an outer inclined face 16, which bevels outwardly toward the casing 1, and the plug 15 a correspondingly inward beveled face 17 v to bear against the face 16. At the bottom of the molding means the outery plug 14 has a lower inwardly inclined face 18 and the plug 15 has an outer correspondingly upwardly and outwardly inclined face 19. that the difference in construction is simply one of reversal of the inclined faces, land by the provision of such faces breaking ofthe corners or angles of the liangeand flangeseat at opposite extremities of the pipe-section will be prevented, as the plugs 15 can be first withdrawn, and thereby reduce the resistance to withdrawal of the plugs 14. The pressure-head 3 contacts directly with lthe adjacent end of the tubular core 2 and the plugs 14 and 15; but the lower tubular pressurehead 3 contacts at one end with an interposed annular pressure-plate 20, which is made in two sections and closely fits in between the casing 1 and core 2. The purpose of making the pressure-plate 20 in two sections is for convenience in removing the same and to avoid sticking of the said plate which might occur if it were made of one piece.

In preparing the mold for use the plugs 14' and 15 are inserted between the casing 1 and 'core 2, at the lower terminals of the latter, theA sectional pressure-plate being then applied to the outer ends of the plugs and the one end of the tubular pressure-head 13 brought to bear against the said pressure-plate. It will be understood that when the pressure-head 13 1s brought to bear against the pressure-plate 20 the rods 9 and 10 ywill haveftheir lower and to render the operation effective It will be observed terminals connected to said pressure-head;-

amount of this relatively dry 'plastic materialV is thus introduced an intermediate moist quantity, of similar material is poured or pushed into the space between the casing and the core and closely packed, and finally an upper quantity or layer of relatively dry plastic material is disposed in the space between the casing and the core on top of the moist intermediate filling of such material. The upper plugs 14 and 15 are then pushed into place, the pressure-head brought down over the plugs and in contact with the upper end of the core 2,'vand the rod 9 is connected to the hook 7 ofthe yoke 6. The mold or molding means willthen be in condition for applying pressure to the plastic filling within the space between the casing 1 an?h core 2,

e lower end of the mold,v including the lower pressurehead 13 and the lower extremities of the rods 9 and 10,l is disposed in a suitably-formed mouth 21 at the upper extremity of a pit 22.' The operator then rotates the hand-wheel 5 in a proper direction to cause the pressurehead 3 tomove downwardly and draw the pressure-head 13 upwardly. The pressurehead 3 being incontact with the upper end IOO of the core 2 will push the latter longitudi` nally through the plastic mass in the space between the casing 1 and core 2, and by a continual exertion of pressure on the material being molded in opposite longitudinal directions the moisture in the intermediate filling will be absorbed by the relatively dry terminal layers or portions of the similar material, and thereby equalize the disposition of the moisture throughout the entire pipe-section and relieve the intermediate portion of the pipe-section of an excess. of moisture.` Thisequalization of the disposition o'f moisture cause the latter to dry out more evenly and also render the molded mass substantially equal in density throughout its length and more perfectly homogeneous. After the material has been sufliciently compressed the rods 9 and 1() are disconnected from the pressure-head 13, the pressure-head 3 and parts connected thereto elevated and turned to one side, and the core 2 pushed down into the pit.y lThe plugs 14 and 15 at opposite ends are disconnected or removed fromthe molded mass,and the pipe-section,

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longitudinally7 of the molded pipe-section will with the outer casing around the same, is then ready for shipment or storage, it being preferred to maintain the intimate relation of the casing l and the molded section until it is desired to use the latter in order to prevent injury to the same.

The modified formation of the device shown by Fig. 4 embodies an upper pressure-head 23, having' a depending rim 24 to contact with an annular pressure-plate 25, which is introduced in the space between the casing l and the core 2. This form of upper pressure-head 23 operates similarly to the lower pressurehead, (shown by Fig'. 1,) and in using' this arrangement of parts the core 2 is not pushed longitudinally through the molded section, but is afterward removed by any suitable means. The remaining parts of the mold, as shown by Fig. 4, are similar to those heretofore described.

From the foregoing it will be seen that a simple and effective mold or molding means for producing pipe-sections from plastic or other analogous material is provided, and while the preferred structure of the several parts has been disclosed it will be understood that chang'es in the form, proportions, dimensions, and minor details may be resorted to without departing' from the spirit of the invention.

Having thus fully described the invention, what is claimed as new isl. In a molding' means, an outer casing, a core spaced apart therefrom to permit a molding material to be introduced between the casing' and core, a pressure-head fitting within the upper end of the casing, a pressure-head situated within the lower end of the casing, a plug interposed between the molding material and upper pressure-head and adapted to fit around the core and provided with an outer beveled face, a plug' of less width adapted to be interposed between said beveled face and the casing, a plug interposed between the molding material and the lower pressure-head and adapted to engage the inner surface of the casing and provided with an inner beveled face, a plug of less width adapted to be interposed between said last-mentioned beveled face and the core, and means for connecting the pressure-heads together and causing them to approach each other.

2. In a molding means, an outer casing, a core spaced apart therefrom to permit a molding material to be introduced between the casing and core, an upper pressure-head, alower pressure-head, rods connected to the lower pressure-head, a yoke pivotally secured to one of said rods and adapted to removably eng'age the other, and a screw swiveled upon the upper pressure-head and movably extending through the yoke.

3. In a moldingI means, an outer casing, a core spaced apart therefrom to permit a molding material to be introduced between the casing and core, a pressure-head fitting within `the upper end of the casing, a pressure-head situated within the lower end of the casing, a plug interposed between the molding' material and upper pressure-head and adapted to fit around the core and provided with an outer beveled face, a plug of less width adapted to be interposed between said beveled face and the casing, a plug' interposed between the molding material and the lower pressure-head and adapted to engage the inner surface of the casing and provided with an inner beveled face, a plug' of less width adapted to be interposed between said last-mentioned beveled face and the core, a plate interposed between the plugs and lower pressure-head, and means for connecting' the pressure-heads together and causing' them to approach each other.

4. In a molding means, an outer casing, a concentric core spaced apart therefrom to permit a molding material to be introduced between the casing and core, a pressure-head fitting' within the upper end of the casing, a pressure-head situated within the lower end of the casing, sectional plugs introduced between the pressure-heads and molding material, and means for connecting' the pressureheads together and causing them to approach each other to exert a longitudinal pressure in opposite directions on the molding' material.

5. In a molding means, an outer casing, a concentric core spaced apart therefrom to permit a molding material to be introduced between the casing and core, a pressure-head fitting within the upper end of the casing, a pressure-head situated within the lower end of the casing, plugs introduced between the pressure-heads and molding' material, a pressure-plate interposed between one of the plugs and pressure-heads, and means for connecting 4the pressure-heads together and causing' them to approach each other to exert a longitudinal pressure in opposite directions on a molding' material.

6. Ina molding means, an outer casing, a concentric core spaced apart therefrom to permit a molding' material to be introduced between the casing and core, a pressure-head fitting within the upper end of the casing, a pressure-head situated in the lower end of the casing, plugs introduced between the pressure-heads and molding' material, a sectional pressure-plate interposed between one of the plugs and pressure-heads, and means for connecting' the pressure-heads together and causing' them to approach each other 'to exert a longitudinalpressure in opposite directions on a molding' material.

In testimony whereof I aiiix my signature in presence of two witnesses.

MAURICE T. STEVENS.

Titnessesz P. H. Conni', C. IV. S'rnvnNs.

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